WO1991014910A1 - Dewatering and drying means for pulp - Google Patents

Dewatering and drying means for pulp Download PDF

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Publication number
WO1991014910A1
WO1991014910A1 PCT/AU1990/000120 AU9000120W WO9114910A1 WO 1991014910 A1 WO1991014910 A1 WO 1991014910A1 AU 9000120 W AU9000120 W AU 9000120W WO 9114910 A1 WO9114910 A1 WO 9114910A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
exhaust
drying zone
zone
delivery
Prior art date
Application number
PCT/AU1990/000120
Other languages
French (fr)
Inventor
Peter James Stewart
Original Assignee
Seaford Nominees Pty Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seaford Nominees Pty Ltd. filed Critical Seaford Nominees Pty Ltd.
Publication of WO1991014910A1 publication Critical patent/WO1991014910A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
    • F26B3/092—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed agitating the fluidised bed, e.g. by vibrating or pulsating
    • F26B3/0923—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed agitating the fluidised bed, e.g. by vibrating or pulsating by mechanical means, e.g. vibrated plate, stirrer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/26—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by reciprocating or oscillating conveyors propelling materials over stationary surfaces; with movement performed by reciprocating or oscillating shelves, sieves, or trays

Definitions

  • THIS INVENTION relates to a dewatering means for dewatering pulp.
  • pulp shall be taken to include pulps, pastes, damp materials and slurries of solid particulate matter carried in suspension or containing a liquid medium.
  • a pulp dewatering means comprising a fluid bed, said fluid bed comprising a delivery zone for receipt of said pulp from said hopper and a drying zone, said delivery zone being separated from the drying zone by a weir and having a porous floor and/or walls associated with a drain, said drying zone comprising a vibrating surface downwardly inclined from the said weir, the lower end of said drying zone depositing particulate material to a delivery outlet, said porous surface being associated with a plenum chamber below the porous surface which is connected to a source of hot gaseous fluid.
  • the delivery outlet is connected to a heat exchanger for further dewatering of said pulp.
  • the source of heat exhaust fluid comprises the exhaust of the heat exchanger.
  • the exhaust of the heat exchanger is associated with means for effecting forced airflow to said plenum chamber from the exhaust.
  • said exhaust is associated with an inlet for cool air whereby said means for effecting said forced airflow draws both hot gases from the exhaust and cool air from the cool air inlet for discharge into said plenum chamber.
  • the inlet for cool air is located at the upper end of a stack extended upwardly from the exhaust.
  • Figure 1 is a side elevation of the embodiment for use in relation to a deactivation kiln; and Figure 2 is a side elevation of the embodiment of figure 1.
  • the embodiment is directed to a means for dewatering carbon pulp prior to the introduction of the carbon pulp into a reactivation kiln of the form described in AU-B- 70646/87.
  • the embodiment comprises a hopper 11 into which carbon pulp is deposited which has an outlet 12 for the delivery of the carbon pulp into the dewatering means 13.
  • the dewatering means comprises a vibrating screen 14 which comprises a delivery zone A and a drying zone B separated by a weir 15.
  • the delivery zone A has a porous floor 16 which is inclined downwardly away from the weir 15 and is associated with a plenum chamber below the porous floor which is provided with a drain 17 which delivers water drained therefrom into a drain outlet 18.
  • the drying zone B also comprises a porous floor 19 which is inclined downwardly away from the weir 15 but with less inclination than the floor of the delivery zone whereby the lower end of the porous floor has a delivery outlet for the delivery of pulp into the inlet hopper of the reactivation kiln 20.
  • the vibrating screen is caused to vibrate by suitable means to assist in the migration of the pulp material down the floor of the drying zone.
  • the underneath the porous floor 19 of the drying zone A has a plenum chamber 22 into which hot exhaust gases from the reactivation kiln is delivered through a flue 23 into the plenum chamber and then into the pulp through the porous floor 19.
  • the vibration of the vibrating screen and thus the porous floor 19 also causes the particles of the pulp to vibrate relative to each other and thus maximise the exposure of the particles to the hot exhaust air.
  • the flue is connected at its lower end to the outlet of a fan 24 which is located at the lower end of an upwardly extending air intake stack 25.
  • a cool inlet 26 is provided at the upper end of the stack 25 and an inlet 27 for exhaust gases from the heat exchanger into the stack is provided in intermediate location therealong.
  • a drive motor 28 for the fan 24 is supported at the lower end of the fan housing.
  • wet carbon pulp is delivered into the hopper 11 and is allowed to flow into the dewatering means through the discharge outlet 12 of the hopper. Initially a quantity of carbon pulp gathers in the delivery zone A until it begins to overflow the weir 15 into the drying zone B.
  • the carbon pulp which originally collects in the delivery zone A remains substantially static in the lower region thereof at least such that the further carbon pulp delivered into the delivery zone flows over that static portion. It seems that the presence of the static portion of the carbon pulp assists in drawing water from the further carbon pulp which flows over its surface such that a significant proportion of water is extracted from the carbon pulp before it overflows the weir 15 into the drying zone B.
  • the vibration which is exerted on both the delivery zone A and a drying zone B causes relative vibration between the particles of the pulp and its migration over the porous floor 19.
  • the pulp is fluidised by the hot air which is injected into the plenum chamber 22 through the flue 23.
  • Such fluidisarion is effected by air which is heated but which is significantly cooler than the temperature of the exhaust gases from the reactivation kiln by virtue of the presence of the cold air inlet 26 provided in the stack 25.
  • the presence of the cool air inlet which allows the introduction of cold air into the hot exhaust gases from the reactivation kiln serves to control the temperature of the air being delivered to the drying zone A.
  • the hot air exhaust will not be drawn into the flue 23 but rather will exhaust from the stack 25 and through the cold air inlet 26. Therefore the presence of the stack 25 and air inlet 26 serves in ensuring that the hot air and for drying the pulp on the vibrating bed is not overheated and caused to oxidise.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Paper (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

A pulp dewatering means comprising a fluid bed, said fluid bed comprising a delivery zone for receipt of said pulp from said hopper and a drying zone, said delivery zone being separated from the drying zone by a weir and having a porous floor and/or walls associated with a drain, said drying zone comprising a vibrating surface downwardly inclined from the said weir, the lower end of said drying zone depositing particulate material to a delivery outlet, said porous surface being associated with a plenum chamber below the porous surface which is connected to a source of hot gaseous fluid.

Description

DEA EKING AND DRYING MEANS FOR PULP ;-" ;
THIS INVENTION relates to a dewatering means for dewatering pulp.
Throughout this specification the term pulp shall be taken to include pulps, pastes, damp materials and slurries of solid particulate matter carried in suspension or containing a liquid medium.
In one form the invention resides in a pulp dewatering means comprising a fluid bed, said fluid bed comprising a delivery zone for receipt of said pulp from said hopper and a drying zone, said delivery zone being separated from the drying zone by a weir and having a porous floor and/or walls associated with a drain, said drying zone comprising a vibrating surface downwardly inclined from the said weir, the lower end of said drying zone depositing particulate material to a delivery outlet, said porous surface being associated with a plenum chamber below the porous surface which is connected to a source of hot gaseous fluid.
According to a preferred feature the delivery outlet is connected to a heat exchanger for further dewatering of said pulp.
According to a preferred feature of the previous feature the source of heat exhaust fluid comprises the exhaust of the heat exchanger.
According to a preferred feature the exhaust of the heat exchanger is associated with means for effecting forced airflow to said plenum chamber from the exhaust.
According to a further preferred feature of the invention said exhaust is associated with an inlet for cool air whereby said means for effecting said forced airflow draws both hot gases from the exhaust and cool air from the cool air inlet for discharge into said plenum chamber.
According to a preferred feature of the previous feature the inlet for cool air is located at the upper end of a stack extended upwardly from the exhaust.
The invention will be more fully understood in the light * of the following description of one specific embodiment. The description is made with reference to the accompanying drawings of which:-
Figure 1 is a side elevation of the embodiment for use in relation to a deactivation kiln; and Figure 2 is a side elevation of the embodiment of figure 1.
The embodiment is directed to a means for dewatering carbon pulp prior to the introduction of the carbon pulp into a reactivation kiln of the form described in AU-B- 70646/87. The embodiment comprises a hopper 11 into which carbon pulp is deposited which has an outlet 12 for the delivery of the carbon pulp into the dewatering means 13. The dewatering means comprises a vibrating screen 14 which comprises a delivery zone A and a drying zone B separated by a weir 15. The delivery zone A has a porous floor 16 which is inclined downwardly away from the weir 15 and is associated with a plenum chamber below the porous floor which is provided with a drain 17 which delivers water drained therefrom into a drain outlet 18. The drying zone B also comprises a porous floor 19 which is inclined downwardly away from the weir 15 but with less inclination than the floor of the delivery zone whereby the lower end of the porous floor has a delivery outlet for the delivery of pulp into the inlet hopper of the reactivation kiln 20. The vibrating screen is caused to vibrate by suitable means to assist in the migration of the pulp material down the floor of the drying zone. The underneath the porous floor 19 of the drying zone A has a plenum chamber 22 into which hot exhaust gases from the reactivation kiln is delivered through a flue 23 into the plenum chamber and then into the pulp through the porous floor 19. The vibration of the vibrating screen and thus the porous floor 19 also causes the particles of the pulp to vibrate relative to each other and thus maximise the exposure of the particles to the hot exhaust air.
The flue is connected at its lower end to the outlet of a fan 24 which is located at the lower end of an upwardly extending air intake stack 25. A cool inlet 26 is provided at the upper end of the stack 25 and an inlet 27 for exhaust gases from the heat exchanger into the stack is provided in intermediate location therealong. A drive motor 28 for the fan 24 is supported at the lower end of the fan housing.
As indicated earlier the reactivation kiln shown in the drawings takes the form of the heat exchanger which is the subject of Australian patent application 70646/87.
In use wet carbon pulp is delivered into the hopper 11 and is allowed to flow into the dewatering means through the discharge outlet 12 of the hopper. Initially a quantity of carbon pulp gathers in the delivery zone A until it begins to overflow the weir 15 into the drying zone B. The carbon pulp which originally collects in the delivery zone A remains substantially static in the lower region thereof at least such that the further carbon pulp delivered into the delivery zone flows over that static portion. It seems that the presence of the static portion of the carbon pulp assists in drawing water from the further carbon pulp which flows over its surface such that a significant proportion of water is extracted from the carbon pulp before it overflows the weir 15 into the drying zone B. On migration of the carbon pulp into the drying zone B the vibration which is exerted on both the delivery zone A and a drying zone B causes relative vibration between the particles of the pulp and its migration over the porous floor 19. In addition the pulp is fluidised by the hot air which is injected into the plenum chamber 22 through the flue 23. Such fluidisarion is effected by air which is heated but which is significantly cooler than the temperature of the exhaust gases from the reactivation kiln by virtue of the presence of the cold air inlet 26 provided in the stack 25. By the time the carbon particles have reached the lower end of the drying zone B substantially most of the water has been driven from them such that on entry into the reactivation kiln they are substantially dry. As indicated in the specification of Australian patent application 70646/87 further draining of any residual water can be effected within the hopper of the reactivation kiln prior to the passage of the carbon particles through the heating chamber.
As indicated above the presence of the cool air inlet which allows the introduction of cold air into the hot exhaust gases from the reactivation kiln serves to control the temperature of the air being delivered to the drying zone A. In the event of the failure of the fan or the motor driving the fan the hot air exhaust will not be drawn into the flue 23 but rather will exhaust from the stack 25 and through the cold air inlet 26. Therefore the presence of the stack 25 and air inlet 26 serves in ensuring that the hot air and for drying the pulp on the vibrating bed is not overheated and caused to oxidise.
It should be appreciated that the scope of the present invention need not be limited to the particular scope of the embodiment described above.

Claims

THE CLAIMS defining the invention are as follows : -
1. A pulp dewatering means comprising a fluid bed, said fluid bed comprising a delivery zone for receipt of said pulp from said hopper and a drying zone, said delivery zone being separated from the drying zone by a weir and having a porous floor and/or walls associated with a drain, said drying zone comprising a vibrating surface downwardly inclined from the said weir, the lower end of said drying zone depositing particulate material to a delivery outlet, said porous surface being associated with a plenum chamber below the porous surface which is connected to a source of hot gaseous fluid.
2. A pulp dewatering means as claimed at claim 1 wherein the delivery outlet is connected to a heat exchanger for further dewatering of said pulp.
3. A pulp dewatering means as claimed at claim 2 wherein the source of hot exhaust fluid comprises the exhaust of the heat exchanger.
4. A pulp dewatering means as claimed at claim 3 wherein the exhaust of the heat exchanger is associated with means for effecting forced airflow to said plenum chamber from the exhaust.
5. A pulp dewatering means as claimed at claim 4 wherein said exhaust is associated with an inlet for cool air whereby said means for effecting said forced airflow draws both hot gases from the exhaust and cool air from the cool air inlet for discharge into said plenum chamber.
6. A pulp dewatering means as claimed at claim 5 wherein the inlet for cool air is located at the upper end of a stack extended upwardly from the exhaust.
7. A pulp dewatering means substantially as herein described.
PCT/AU1990/000120 1988-11-23 1990-03-29 Dewatering and drying means for pulp WO1991014910A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AUPJ160388 1988-11-23

Publications (1)

Publication Number Publication Date
WO1991014910A1 true WO1991014910A1 (en) 1991-10-03

Family

ID=3773532

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1990/000120 WO1991014910A1 (en) 1988-11-23 1990-03-29 Dewatering and drying means for pulp

Country Status (6)

Country Link
US (1) US5024005A (en)
AU (1) AU619626B2 (en)
CA (1) CA2003724C (en)
NZ (1) NZ231504A (en)
WO (1) WO1991014910A1 (en)
ZA (1) ZA898895B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106524669A (en) * 2016-12-13 2017-03-22 广西大学 Vibrated fluidized bed drying machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008025240A1 (en) * 2008-05-27 2009-12-03 Automatik Plastics Machinery Gmbh Drying device for drying granules

Citations (12)

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DE606426C (en) * 1933-09-10 1934-12-01 Albert Von Lom Dipl Ing Dryer for grain or other grainy or lumpy goods
GB462145A (en) * 1934-11-19 1937-03-03 Albert Von Lom Improvements in or relating to drying plants
DE1017072B (en) * 1954-05-11 1957-10-03 Moeller Johannes Cooling device for highly heated goods that are produced in a grainy or coarse state
DE974798C (en) * 1951-09-22 1961-05-04 Josef Dipl-Ing Schimunek Method and device for drying or cooling bulk goods
GB868675A (en) * 1958-03-26 1961-05-25 Gascoignes Reading Ltd Improvements relating to the drying of granular, powdered and other flowable materials
US3511843A (en) * 1965-11-06 1970-05-12 Imp Tobacco Co Ltd Plural stage fluidization and vibration of cohesive plant material
DE1729451A1 (en) * 1966-06-28 1971-06-09 Grenobloise Etude Appl Device for drying washed loose goods
US3900958A (en) * 1972-09-30 1975-08-26 Kloeckner Humboldt Deutz Ag Method and apparatus for continuously drying a dripping wet, granular or lumpy material
SU496453A1 (en) * 1974-02-12 1975-12-25 Ордена Трудового Красного Знамени Институт Тепло- И Массообмена Ан Бсср The method of drying high-moisture materials
GB1447714A (en) * 1973-06-18 1976-08-25 Wilkinson Rubber Linatex Ltd Screen panel assembly for removing water from a slurry
US4112587A (en) * 1976-02-09 1978-09-12 A. Ahlstrom Osakeyhtio Method and means for drying a fibre material containing cellulose
SU661223A1 (en) * 1977-01-03 1979-05-05 Ордена Трудового Красного Знамени Институт Тепло И Массообмена Им. А.В.Лыкова Ан Белорусской Сср Device for heat and moisture treatment of concrete fillers

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US3089688A (en) * 1961-03-06 1963-05-14 Dundee Cement Co Cement manufacture
FR2112750A5 (en) * 1970-11-06 1972-06-23 Constantin E
US3703861A (en) * 1971-06-25 1972-11-28 Farm Automatic Feeding Ltd Raw organic material cooker
DK150716C (en) * 1976-12-01 1987-10-26 Niro Atomizer As PROCEDURE FOR TREATING A POWDER OR PARTICULATED PRODUCT AND APPARATUS FOR USE IN EXERCISING THE PROCEDURE
JPS61134587A (en) * 1984-12-03 1986-06-21 太平洋セメント株式会社 Controller for clinker cooling device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE606426C (en) * 1933-09-10 1934-12-01 Albert Von Lom Dipl Ing Dryer for grain or other grainy or lumpy goods
GB462145A (en) * 1934-11-19 1937-03-03 Albert Von Lom Improvements in or relating to drying plants
DE974798C (en) * 1951-09-22 1961-05-04 Josef Dipl-Ing Schimunek Method and device for drying or cooling bulk goods
DE1017072B (en) * 1954-05-11 1957-10-03 Moeller Johannes Cooling device for highly heated goods that are produced in a grainy or coarse state
GB868675A (en) * 1958-03-26 1961-05-25 Gascoignes Reading Ltd Improvements relating to the drying of granular, powdered and other flowable materials
US3511843A (en) * 1965-11-06 1970-05-12 Imp Tobacco Co Ltd Plural stage fluidization and vibration of cohesive plant material
DE1729451A1 (en) * 1966-06-28 1971-06-09 Grenobloise Etude Appl Device for drying washed loose goods
US3900958A (en) * 1972-09-30 1975-08-26 Kloeckner Humboldt Deutz Ag Method and apparatus for continuously drying a dripping wet, granular or lumpy material
GB1447714A (en) * 1973-06-18 1976-08-25 Wilkinson Rubber Linatex Ltd Screen panel assembly for removing water from a slurry
SU496453A1 (en) * 1974-02-12 1975-12-25 Ордена Трудового Красного Знамени Институт Тепло- И Массообмена Ан Бсср The method of drying high-moisture materials
US4112587A (en) * 1976-02-09 1978-09-12 A. Ahlstrom Osakeyhtio Method and means for drying a fibre material containing cellulose
SU661223A1 (en) * 1977-01-03 1979-05-05 Ордена Трудового Красного Знамени Институт Тепло И Массообмена Им. А.В.Лыкова Ан Белорусской Сср Device for heat and moisture treatment of concrete fillers

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DERWENT ABSTRACT, Accession No. 06859C/04, Class L02; & SU,A,661 223, (HEAT MASS TRANSFER), 15 May 1979. *
DERWENT ABSTRACT, Accession No. 37577Y/21, Class J08; & SU,A,496 453, (AS BELO HEAT MASS), 27 May 1976. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106524669A (en) * 2016-12-13 2017-03-22 广西大学 Vibrated fluidized bed drying machine

Also Published As

Publication number Publication date
US5024005A (en) 1991-06-18
CA2003724C (en) 1998-07-28
CA2003724A1 (en) 1990-05-23
AU619626B2 (en) 1992-01-30
AU4552589A (en) 1990-05-31
NZ231504A (en) 1991-10-25
ZA898895B (en) 1990-08-29

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